Authors : G.V. Lakhekar, L.M. Waghmare and V.G. Asutkar
Abstract: The methodology proposes fuzzy logic Proportional-Integral-Derivative (fuzzy PID) and fuzzy cascade controller architecture and its performance have been compared with the classical control techniques such as Conventional Feedback Control (CFC) and Conventional Cascade Control (CCC) for continuous stirrer tank heater. Fuzzy logic control technology has been widely used and successfully utilized in numerous industrial applications. The Proposed Control architecture is effective especially when the controlled object operates under uncertainty or in the presence of a disturbance. This design methodology introduces a new controller structure has been achieved by blending classical and fuzzy logic controller in an intelligent way. The configuration of fuzzy PID controller is basically composed of three parallel fuzzy subcontrollers. The additional conventional PID controller placed in parallel with fuzzy subcontrollers are grouped together to form the overall fuzzy PID controller. The fuzzy cascade controller consists of fuzzy PID as primary controller and fuzzy logic Proportional-Integral (fuzzy PI) as secondary controller. The simulated results show that the fuzzy control approach gives improved control performances than the conventional controllers particularly in handling nonlinearities and external disturbances. The performance of various control strategy has been compared in terms of Integral Square Error (ISE).
G.V. Lakhekar, L.M. Waghmare and V.G. Asutkar, 2010. Fuzzy Approach for Cascade Control of Interconnected System. International Journal of Soft Computing, 5: 116-127.